WindowPet release v0.0.6

Change log:

• Improvements:
  • Improve update pop up user interface with information such as change log
  • Sprite sheet has been compressed to reduce app size
  • Dynamically load sprite sheet instead of pre-load to reduce memory usage
  • Remove texture when there is no more pet to reduce memory usage
• Fixes:
  • Fix a case where adding new pet show green/black rectangle moving around